Stopping The Cpu (Unintentional Output Prevention) - Mitsubishi Electric Q Series Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
DANGER
CAUTION

4.3.4 Stopping the CPU (unintentional output prevention)

STOP RUN
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[Module handling precautions]
• Since the module case is made of resin, do not drop it or subject it to strong
impacts.
• The module can be easily fixed onto the base unit using the hook at the top of
the module. However, it is recommended to secure the module with the
module mounting screw if the module is subject to significant vibration or
shock. In that case, tighten the module fixing screws within the following range.
Module fixing screws (M3): Tightening torque range is 0.36 to 0.48N·m.
• The following range must be applied when tightening the external supply power
terminal screws for the QJ71LP21S-25. For specifications of the external
supply power terminal screws, refer to section 3.1.1.
External supply power terminal screws (M3): Tightening torque range is 0.42
to 0.58 N·m.
• Do not touch the terminals and the connectors while the power to the module is on.
Doing so may cause electric shocks or malfunctions.
• If the module is not mounted properly and fastened with the screws, it may cause
the module to malfunction, break down or fall off. If the screws are tightened
excessively, it may damage the module and the screws, and cause the module to
short-circuit, malfunction or fall off.
• Be careful not to let foreign particles such as chaff or wire chips enter the module.
They may cause fire, breakdowns or malfunctions.
• Never disassemble or modify the module.
It may cause breakdowns, malfunctions, injuries or fire.
Set the RUN/STOP switch *1 of the CPU module to STOP.
*1: Use the RESET/STOP/RUN switch for the Basic model QCPU, Universal model
QCPU, and safety CPU.
MELSEC-Q
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